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Diffstat (limited to 'core/fxcrt/fx_basic_array.cpp')
| -rw-r--r-- | core/fxcrt/fx_basic_array.cpp | 342 |
1 files changed, 342 insertions, 0 deletions
diff --git a/core/fxcrt/fx_basic_array.cpp b/core/fxcrt/fx_basic_array.cpp new file mode 100644 index 0000000000..18e2bd26d2 --- /dev/null +++ b/core/fxcrt/fx_basic_array.cpp @@ -0,0 +1,342 @@ +// Copyright 2014 PDFium Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. + +// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com + +#include "core/include/fxcrt/fx_basic.h" +#include "third_party/base/numerics/safe_math.h" + +CFX_BasicArray::CFX_BasicArray(int unit_size) + : m_pData(NULL), m_nSize(0), m_nMaxSize(0) { + if (unit_size < 0 || unit_size > (1 << 28)) { + m_nUnitSize = 4; + } else { + m_nUnitSize = unit_size; + } +} +CFX_BasicArray::~CFX_BasicArray() { + FX_Free(m_pData); +} +FX_BOOL CFX_BasicArray::SetSize(int nNewSize) { + if (nNewSize <= 0) { + FX_Free(m_pData); + m_pData = NULL; + m_nSize = m_nMaxSize = 0; + return 0 == nNewSize; + } + + if (!m_pData) { + pdfium::base::CheckedNumeric<int> totalSize = nNewSize; + totalSize *= m_nUnitSize; + if (!totalSize.IsValid()) { + m_nSize = m_nMaxSize = 0; + return FALSE; + } + m_pData = FX_Alloc(uint8_t, totalSize.ValueOrDie()); + m_nSize = m_nMaxSize = nNewSize; + } else if (nNewSize <= m_nMaxSize) { + if (nNewSize > m_nSize) { + FXSYS_memset(m_pData + m_nSize * m_nUnitSize, 0, + (nNewSize - m_nSize) * m_nUnitSize); + } + m_nSize = nNewSize; + } else { + int nNewMax = nNewSize < m_nMaxSize ? m_nMaxSize : nNewSize; + pdfium::base::CheckedNumeric<int> totalSize = nNewMax; + totalSize *= m_nUnitSize; + if (!totalSize.IsValid() || nNewMax < m_nSize) { + return FALSE; + } + uint8_t* pNewData = FX_Realloc(uint8_t, m_pData, totalSize.ValueOrDie()); + if (!pNewData) { + return FALSE; + } + FXSYS_memset(pNewData + m_nSize * m_nUnitSize, 0, + (nNewMax - m_nSize) * m_nUnitSize); + m_pData = pNewData; + m_nSize = nNewSize; + m_nMaxSize = nNewMax; + } + return TRUE; +} +FX_BOOL CFX_BasicArray::Append(const CFX_BasicArray& src) { + int nOldSize = m_nSize; + pdfium::base::CheckedNumeric<int> newSize = m_nSize; + newSize += src.m_nSize; + if (m_nUnitSize != src.m_nUnitSize || !newSize.IsValid() || + !SetSize(newSize.ValueOrDie())) { + return FALSE; + } + + FXSYS_memcpy(m_pData + nOldSize * m_nUnitSize, src.m_pData, + src.m_nSize * m_nUnitSize); + return TRUE; +} +FX_BOOL CFX_BasicArray::Copy(const CFX_BasicArray& src) { + if (!SetSize(src.m_nSize)) { + return FALSE; + } + FXSYS_memcpy(m_pData, src.m_pData, src.m_nSize * m_nUnitSize); + return TRUE; +} +uint8_t* CFX_BasicArray::InsertSpaceAt(int nIndex, int nCount) { + if (nIndex < 0 || nCount <= 0) { + return NULL; + } + if (nIndex >= m_nSize) { + if (!SetSize(nIndex + nCount)) { + return NULL; + } + } else { + int nOldSize = m_nSize; + if (!SetSize(m_nSize + nCount)) { + return NULL; + } + FXSYS_memmove(m_pData + (nIndex + nCount) * m_nUnitSize, + m_pData + nIndex * m_nUnitSize, + (nOldSize - nIndex) * m_nUnitSize); + FXSYS_memset(m_pData + nIndex * m_nUnitSize, 0, nCount * m_nUnitSize); + } + return m_pData + nIndex * m_nUnitSize; +} +FX_BOOL CFX_BasicArray::RemoveAt(int nIndex, int nCount) { + if (nIndex < 0 || nCount <= 0 || m_nSize < nIndex + nCount) { + return FALSE; + } + int nMoveCount = m_nSize - (nIndex + nCount); + if (nMoveCount) { + FXSYS_memmove(m_pData + nIndex * m_nUnitSize, + m_pData + (nIndex + nCount) * m_nUnitSize, + nMoveCount * m_nUnitSize); + } + m_nSize -= nCount; + return TRUE; +} +FX_BOOL CFX_BasicArray::InsertAt(int nStartIndex, + const CFX_BasicArray* pNewArray) { + if (!pNewArray) { + return FALSE; + } + if (pNewArray->m_nSize == 0) { + return TRUE; + } + if (!InsertSpaceAt(nStartIndex, pNewArray->m_nSize)) { + return FALSE; + } + FXSYS_memcpy(m_pData + nStartIndex * m_nUnitSize, pNewArray->m_pData, + pNewArray->m_nSize * m_nUnitSize); + return TRUE; +} +const void* CFX_BasicArray::GetDataPtr(int index) const { + if (index < 0 || index >= m_nSize || !m_pData) { + return NULL; + } + return m_pData + index * m_nUnitSize; +} +#ifdef PDF_ENABLE_XFA +CFX_BaseSegmentedArray::CFX_BaseSegmentedArray(int unit_size, + int segment_units, + int index_size) + : m_UnitSize(unit_size), + m_SegmentSize(segment_units), + m_IndexSize(index_size), + m_IndexDepth(0), + m_DataSize(0), + m_pIndex(NULL) {} +void CFX_BaseSegmentedArray::SetUnitSize(int unit_size, + int segment_units, + int index_size) { + ASSERT(m_DataSize == 0); + m_UnitSize = unit_size; + m_SegmentSize = segment_units; + m_IndexSize = index_size; +} +CFX_BaseSegmentedArray::~CFX_BaseSegmentedArray() { + RemoveAll(); +} +static void _ClearIndex(int level, int size, void** pIndex) { + if (level == 0) { + FX_Free(pIndex); + return; + } + for (int i = 0; i < size; ++i) { + if (pIndex[i]) + _ClearIndex(level - 1, size, (void**)pIndex[i]); + } + FX_Free(pIndex); +} +void CFX_BaseSegmentedArray::RemoveAll() { + if (!m_pIndex) { + return; + } + _ClearIndex(m_IndexDepth, m_IndexSize, (void**)m_pIndex); + m_pIndex = NULL; + m_IndexDepth = 0; + m_DataSize = 0; +} +void* CFX_BaseSegmentedArray::Add() { + if (m_DataSize % m_SegmentSize) { + return GetAt(m_DataSize++); + } + void* pSegment = FX_Alloc2D(uint8_t, m_UnitSize, m_SegmentSize); + if (!m_pIndex) { + m_pIndex = pSegment; + m_DataSize++; + return pSegment; + } + if (m_IndexDepth == 0) { + void** pIndex = FX_Alloc(void*, m_IndexSize); + pIndex[0] = m_pIndex; + pIndex[1] = pSegment; + m_pIndex = pIndex; + m_DataSize++; + m_IndexDepth++; + return pSegment; + } + int seg_index = m_DataSize / m_SegmentSize; + if (seg_index % m_IndexSize) { + void** pIndex = GetIndex(seg_index); + pIndex[seg_index % m_IndexSize] = pSegment; + m_DataSize++; + return pSegment; + } + int tree_size = 1; + int i; + for (i = 0; i < m_IndexDepth; i++) { + tree_size *= m_IndexSize; + } + if (m_DataSize == tree_size * m_SegmentSize) { + void** pIndex = FX_Alloc(void*, m_IndexSize); + pIndex[0] = m_pIndex; + m_pIndex = pIndex; + m_IndexDepth++; + } else { + tree_size /= m_IndexSize; + } + void** pSpot = (void**)m_pIndex; + for (i = 1; i < m_IndexDepth; i++) { + if (!pSpot[seg_index / tree_size]) { + pSpot[seg_index / tree_size] = FX_Alloc(void*, m_IndexSize); + } + pSpot = (void**)pSpot[seg_index / tree_size]; + seg_index = seg_index % tree_size; + tree_size /= m_IndexSize; + } + if (i < m_IndexDepth) { + FX_Free(pSegment); + RemoveAll(); + return NULL; + } + pSpot[seg_index % m_IndexSize] = pSegment; + m_DataSize++; + return pSegment; +} +void** CFX_BaseSegmentedArray::GetIndex(int seg_index) const { + ASSERT(m_IndexDepth != 0); + if (m_IndexDepth == 1) { + return (void**)m_pIndex; + } + if (m_IndexDepth == 2) { + return (void**)((void**)m_pIndex)[seg_index / m_IndexSize]; + } + int tree_size = 1; + int i; + for (i = 1; i < m_IndexDepth; i++) { + tree_size *= m_IndexSize; + } + void** pSpot = (void**)m_pIndex; + for (i = 1; i < m_IndexDepth; i++) { + pSpot = (void**)pSpot[seg_index / tree_size]; + seg_index = seg_index % tree_size; + tree_size /= m_IndexSize; + } + return pSpot; +} +void* CFX_BaseSegmentedArray::IterateSegment(const uint8_t* pSegment, + int count, + FX_BOOL (*callback)(void* param, + void* pData), + void* param) const { + for (int i = 0; i < count; i++) { + if (!callback(param, (void*)(pSegment + i * m_UnitSize))) { + return (void*)(pSegment + i * m_UnitSize); + } + } + return NULL; +} +void* CFX_BaseSegmentedArray::IterateIndex(int level, + int& start, + void** pIndex, + FX_BOOL (*callback)(void* param, + void* pData), + void* param) const { + if (level == 0) { + int count = m_DataSize - start; + if (count > m_SegmentSize) { + count = m_SegmentSize; + } + start += count; + return IterateSegment((const uint8_t*)pIndex, count, callback, param); + } + for (int i = 0; i < m_IndexSize; i++) { + if (!pIndex[i]) { + continue; + } + void* p = + IterateIndex(level - 1, start, (void**)pIndex[i], callback, param); + if (p) { + return p; + } + } + return NULL; +} +void* CFX_BaseSegmentedArray::Iterate(FX_BOOL (*callback)(void* param, + void* pData), + void* param) const { + if (!m_pIndex) { + return NULL; + } + int start = 0; + return IterateIndex(m_IndexDepth, start, (void**)m_pIndex, callback, param); +} +void* CFX_BaseSegmentedArray::GetAt(int index) const { + if (index < 0 || index >= m_DataSize) { + return NULL; + } + if (m_IndexDepth == 0) { + return (uint8_t*)m_pIndex + m_UnitSize * index; + } + int seg_index = index / m_SegmentSize; + return (uint8_t*)GetIndex(seg_index)[seg_index % m_IndexSize] + + (index % m_SegmentSize) * m_UnitSize; +} +void CFX_BaseSegmentedArray::Delete(int index, int count) { + if (index < 0 || count < 1 || index + count > m_DataSize) { + return; + } + int i; + for (i = index; i < m_DataSize - count; i++) { + uint8_t* pSrc = (uint8_t*)GetAt(i + count); + uint8_t* pDest = (uint8_t*)GetAt(i); + for (int j = 0; j < m_UnitSize; j++) { + pDest[j] = pSrc[j]; + } + } + int new_segs = (m_DataSize - count + m_SegmentSize - 1) / m_SegmentSize; + int old_segs = (m_DataSize + m_SegmentSize - 1) / m_SegmentSize; + if (new_segs < old_segs) { + if (m_IndexDepth) { + for (i = new_segs; i < old_segs; i++) { + void** pIndex = GetIndex(i); + FX_Free(pIndex[i % m_IndexSize]); + pIndex[i % m_IndexSize] = NULL; + } + } else { + FX_Free(m_pIndex); + m_pIndex = NULL; + } + } + m_DataSize -= count; +} +#endif // PDF_ENABLE_XFA |